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<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <style>
    
        .div1{
            color: red;
        }

        #haha1{
            font-size: 30px;
        }

        #haha2{
            font-weight: bold;
        }
    
    </style>
</head>
<body>
    
    <!--id如果设置相同不会报错 但是开发中 不要重复 用于区分标签-->
    <div class="div1"  id="haha1">佛挡杀佛说多少</div>

    <div class="div1"  id="haha2">佛挡杀佛说多少</div>

    <div class="div1"  id="haha3">佛挡杀佛说多少</div>


</body>
</html>